Loans and Allowance for Credit Losses Troubled Debt Restructuring Modification (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 loans	Mar. 31, 2013 loans
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDRs during the reporting periods	31	58
Recorded investment of loans modified as TDRs during the reporting periods	$ 9,258	$ 8,898
Number of loans modified as TDRs within the previous 12 months which had a payment default during the reporting period	31	74
Recorded investment of loans modified as TDRs within the previous 12 months which had a payment default during the reporting period	4,710	16,921
Real-estate commercial mortage [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDRs during the reporting periods	7	5
Recorded investment of loans modified as TDRs during the reporting periods	7,470	2,652
Number of loans modified as TDRs within the previous 12 months which had a payment default during the reporting period	3	12
Recorded investment of loans modified as TDRs within the previous 12 months which had a payment default during the reporting period	126	6,893
Real-estate - residential mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDRs during the reporting periods	6	28
Recorded investment of loans modified as TDRs during the reporting periods	706	3,966
Number of loans modified as TDRs within the previous 12 months which had a payment default during the reporting period	12	31
Recorded investment of loans modified as TDRs within the previous 12 months which had a payment default during the reporting period	2,522	5,849
Construction - commercial residential [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDRs during the reporting periods	1	2
Recorded investment of loans modified as TDRs during the reporting periods	548	628
Real-estate - home equity [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDRs during the reporting periods	10	17
Recorded investment of loans modified as TDRs during the reporting periods	529	1,180
Number of loans modified as TDRs within the previous 12 months which had a payment default during the reporting period	14	20
Recorded investment of loans modified as TDRs within the previous 12 months which had a payment default during the reporting period	1,432	1,233
Commercial - Secured [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDRs during the reporting periods	0	5
Recorded investment of loans modified as TDRs during the reporting periods	0	457
Number of loans modified as TDRs within the previous 12 months which had a payment default during the reporting period	1	6
Recorded investment of loans modified as TDRs within the previous 12 months which had a payment default during the reporting period	11	708
Commercial - unsecured [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDRs during the reporting periods	0	1
Recorded investment of loans modified as TDRs during the reporting periods	0	15
Construction - Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDRs within the previous 12 months which had a payment default during the reporting period	0	1
Recorded investment of loans modified as TDRs within the previous 12 months which had a payment default during the reporting period	0	930
Consumer - direct [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDRs during the reporting periods	4	0
Recorded investment of loans modified as TDRs during the reporting periods	4	0
Consumer - Indirect [Member]
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDRs during the reporting periods	3	0
Recorded investment of loans modified as TDRs during the reporting periods	$ 1	$ 0